Помогите,что сможетее

1. ответ 2.
${45}^{10} {5}^{30} = {(9 \times 5)}^{10} {5}^{30} = \\ = {9}^{10} {5}^{10} {5}^{30} = {9}^{10} {5}^{40} = \\ = {( {3}^{2} )}^{10} {5}^{2 \times 20} = {3}^{20} { ({5}^{2}) }^{20} = \\ = {3}^{20} {25}^{20} = (3 \times 25) {}^{20} = \\ = {75}^{20}$
2. ответ 3.
${90}^{10} {2}^{20} = {90}^{10} {2}^{2 \times 10} = \\ = {90}^{10} { ({2}^{2} )}^{10} = \\ = {90}^{10} {4}^{10} = {(90 \times 4)}^{10} = \\ = {360}^{10}$